Alright.  so I'm looking at harddrives for expanding my storage probably for the next couples years until ssd's are cheap and I only have enough money for a cheap sata ii hd.  This one thats in my price range happens to be the same model as the one that I've had for a couple years and its still working perfectly so I was thinking why not do raid 0?  Only reason I ask is because Iv'e heard its better to get all drives from the same batch for raid but would that matter too much?  hares the link http://www.newegg.com/Product/Product.aspx?Item=N82E16822136696